Электрохимические свойства наночастиц серебра на графитовом электроде

В настоящей работе было показано, что наночастицы серебра, полученные при молярном соотношении реагентов [AgNO3]: [Na3C6H5O7] = 1:1 в условии отсутствии стабилизатора с высоким молекулярным весом, обладают максимальной электрохимической активностью, что связано с неполным восстановлением ионов серебра. Этот факт соотносится с данными УФ-спектроскопии. Наночастицы серебра, полученные в избытке восстановителя при молярном соотношении реагентов [AgNO3]: [Na3C6H5O7] = 1:5 электрохимически неактивны, что также соответствует данным УФ- спектроскопии. Увеличение активности наночастиц серебра происходит в условии увеличения диапазона изменения потенциала, что может быть вызвано образованием перекиси водорода, обладающей активационной способностью. В данной работе установлены оптимальные условия, в которых наночастицы серебра являются наиболее электрохимически активны

Evaluation of equivalent defect heat generation in carbon epoxy composite under powerful ultrasonic stimulation by using infrared thermography

Low velocity impact is a frequently observed event during the operation of an aircraft composite structure. This type of damage is aptly called as "blind-side impact damage" as it is barely visible as a dent on the impacted surface, but may produce extended delaminations closer to the rear surface. One-sided thermal nondestructive testing is considered as a promising technique for detecting impact damage but because of diffusive nature of optical thermal signals there is drop in detectability of deeper subsurface defects. Ultrasonic Infrared thermography is a potentially attractive nondestructive evaluation technique used to detect the defects through observation of vibration-induced heat generation. Evaluation of the energy released by such defects is a challenging task. In this study, the thin delaminations caused by impact damage in composites and which are subjected to ultrasonic excitation are considered as local heat sources. The actual impact damage in a carbon epoxy composite which was detected by applying a magnetostrictive ultrasonic device is then modeled as a pyramid-like defect with a set of delaminations acting as an air-filled heat sources. The temperature rise expected on the surface of the specimen was achieved by varying energy contribution from each delamination through trial and error. Finally, by comparing the experimental temperature elevations in defective area with the results of temperature simulations, we estimated the energy generated by each defect and defect power of impact damage as a whole. The results show good correlation between simulations and measurements, thus validating the simulation approach

The FEATURE framework for protein function annotation: modeling new functions, improving performance, and extending to novel applications

Structural genomics efforts contribute new protein structures that often lack significant sequence and fold similarity to known proteins. Traditional sequence and structure-based methods may not be sufficient to annotate the molecular functions of these structures. Techniques that combine structural and functional modeling can be valuable for functional annotation. FEATURE is a flexible framework for modeling and recognition of functional sites in macromolecular structures. Here, we present an overview of the main components of the FEATURE framework, and describe the recent developments in its use. These include automating training sets selection to increase functional coverage, coupling FEATURE to structural diversity generating methods such as molecular dynamics simulations and loop modeling methods to improve performance, and using FEATURE in large-scale modeling and structure determination efforts

Mineral waters, metabolism, neuro-endocrine-immune complex, s. 252.

Dedicated to the 75th anniversary of Volodymyr Illich Kozyavkin with gratitude for the support of the Truskavetsian Scientific School of BalneologyThe monograph systematizes these writers and highlights the results of their own priority experimental and clinical-physiological studies of the impact of drinking mineral waters of Ukraine on neuroendocrine regulation, metabolism and immunity of healthy rats and patients in the process of rehabilitation of chronic pyelonephritis and cholecystitis in remission. In line with the concepts of functional-metabolic continuum and neuroendocrine-immune complex using the methods of factor, discriminant and canonical correlation analysis, it is demonstrated that mineral waters have both similar and specific physiologically favorable modulating effects on the parameters of the studied body systems. For specialists in medical rehabilitation, endocrinologists, immunologists, biochemists, pathophysiologists

Genetic Modifier Screens Reveal New Components that Interact with the Drosophila Dystroglycan-Dystrophin Complex

The Dystroglycan-Dystrophin (Dg-Dys) complex has a capacity to transmit information from the extracellular matrix to the cytoskeleton inside the cell. It is proposed that this interaction is under tight regulation; however the signaling/regulatory components of Dg-Dys complex remain elusive. Understanding the regulation of the complex is critical since defects in this complex cause muscular dystrophy in humans. To reveal new regulators of the Dg-Dys complex, we used a model organism Drosophila melanogaster and performed genetic interaction screens to identify modifiers of Dg and Dys mutants in Drosophila wing veins. These mutant screens revealed that the Dg-Dys complex interacts with genes involved in muscle function and components of Notch, TGF-β and EGFR signaling pathways. In addition, components of pathways that are required for cellular and/or axonal migration through cytoskeletal regulation, such as Semaphorin-Plexin, Frazzled-Netrin and Slit-Robo pathways show interactions with Dys and/or Dg. These data suggest that the Dg-Dys complex and the other pathways regulating extracellular information transfer to the cytoskeletal dynamics are more intercalated than previously thought

Homologous organization of cerebellar pathways to sensory, motor, and associative forebrain.

Cerebellar outputs take polysynaptic routes to reach the rest of the brain, impeding conventional tracing. Here, we quantify pathways between the cerebellum and forebrain by using transsynaptic tracing viruses and a whole-brain analysis pipeline. With retrograde tracing, we find that most descending paths originate from the somatomotor cortex. Anterograde tracing of ascending paths encompasses most thalamic nuclei, especially ventral posteromedial, lateral posterior, mediodorsal, and reticular nuclei. In the neocortex, sensorimotor regions contain the most labeled neurons, but we find higher densities in associative areas, including orbital, anterior cingulate, prelimbic, and infralimbic cortex. Patterns of ascending expression correlate with c-Fos expression after optogenetic inhibition of Purkinje cells. Our results reveal homologous networks linking single areas of the cerebellar cortex to diverse forebrain targets. We conclude that shared areas of the cerebellum are positioned to provide sensory-motor information to regions implicated in both movement and nonmotor function

Преодоление антипрививочного скепсиса: поиски решения выхода из сложившейся ситуации

Background. The problem of distrust of immunization is widespread not only in Russia but also all over the world. Many parents refuse to vaccinate their child reasoning that the vaccines can harm their health, the immune system may not cope with the body burden; and some doctors themselves discourage parents from vaccination. Our aim was to assess the attitude of doctors and parents towards vaccination whose children are vaccinated completely or partially; to study the most frequent reasons for refusals of vaccination by parents. Methods. We used the questionnaires for parents (n = 114) who brought their children for vaccination for the first time or repeatedly; and the questionnaires for students of 4–6 courses and interns of medical universities (n = 336) who expressed their sentiments towards vaccination and demonstrated the knowledge of the national and regional immunization schedules. AstonGroup also conducted studies among physicians of different specialties (n = 307) on the most frequent reasons for refusals of vaccination. Results. In most cases, the parents’ attitude towards vaccination was positive. One in three patient representatives considered that he was fully acquainted with immunization issues, and more than half wanted to be vaccinated only within the national immunization schedule. In almost 100% of cases, parents had trust in information about vaccination received from a doctor. The results of the AstonGroup survey showed that the most frequent medical exemptions were given by neurologists, immunologists, and surgeons. And the parents themselves, who brought their children to see doctors, reasoned their refusals of vaccination with fear of complications and also considered vaccination to be harmful and useless. The doctors participating in the survey offered methods for influencing the parents, namely: providing them with accessible information about vaccinations included in the national immunization schedule as well as about the experience of using vaccines, including other countries. Discussion. The survey revealed insufficient knowledge of the national immunization schedule among students as well as cautious attitude towards vaccination issues and the trust in vaccination myths among legally authorized representatives of patients. Conclusion. The effective measures to combat ‘anti-vaccination scepticism’ are lectures for parents; personal, social and health education at pediatric sites as well as continuing medical education.Обоснование. Проблема недоверия к иммунизации широко распространена не только в России, но и во всем мире. Многие родители отказываются прививать своего ребенка, аргументируя это тем, что вакцины могут нанести вред здоровью, иммунная система может не справиться с нагрузкой на организм, к тому же некоторые врачи сами отговаривают родителей от вакцинации.Цель исследования — оценить отношение к вакцинации врачей и родителей, дети которых привиты полностью либо частично; изучить наиболее частые причины отказов от прививок со стороны родителей.Методы. Использованы вопросники для родителей (n=114), приведших на вакцинацию своих детей впервые или повторно; анкеты для студентов 4–6-х курсов и интернов медицинских вузов (n=336), которые выражали свое отношение к вакцинации и демонстрировали знания национального и регионального календарей профилактических прививок. Компания Aston Group также проводила исследования среди врачей разных специальностей (n=307) о наиболее частых причинах отказов от вакцинации.Результаты. В большинстве случаев отношение родителей к вакцинации было позитивным, каждый третий представитель пациента считал, что полностью информирован в вопросах иммунизации и больше половины хотели прививаться только в рамках национального календаря профилактических прививок. Практически в 100% случаев родители доверяли информации о прививках, полученной от врача. Результаты опроса компании Aston Group показали, что самые частые медотводы давали неврологи, иммунологи и хирурги. А сами родители, приходящие с детьми на прием к врачам, мотивировали свои отказы от прививок боязнью осложнений, а также считали вакцинацию вредной и бесполезной. Врачами, участвующими в опросе, были предложены методы по воздействию на родителей пациентов, а именно: обеспечение их доступной информацией о прививках, входящих в национальный календарь профилактических прививок, а также об опыте применения вакцин, в том числе в других странах.Обсуждение. Проведенный опрос выявил недостаточное знание Национального календаря профилактических прививок среди студентов, а также многочисленные заблуждения в отношении профилактических прививок со стороны других педиатрических специалистов (особенно детских неврологов и детских аллергологов-иммунологов), осторожное отношение в вопросах вакцинации и доверие к «мифам» о прививках среди законных представителей пациентов. Заключение. Эффективными мероприятиями на пути борьбы с антипрививочным скепсисом являются лекции для родителей, санитарно-просветительская работа на педиатрических участках, а также повышение квалификации врачей.КОНФЛИКТ ИНТЕРЕСОВ Л.С. Намазова-Баранова — получение исследовательских грантов от фармацевтических компаний Пьер Фабр, Genzyme Europe B. V., ООО «Астра зенека Фармасьютикалз», Gilead/PRA «Фармасьютикал Рисерч Ассошиэйтс СиАйЭс», «Bionorica», Teva Branded Pharmaceutical products R&D, Inc/ООО «ППД Девелопмент (Смоленск)», «Сталлержен С. А.»/«Квинтайлс ГезмбХ» (Австрия). Остальные авторы данной статьи подтверждают отсутствие конфликта интересов, о котором необходимо сообщит

The recombinant fusion protein CFP10–ESAT6–dIFN has protective effect against tuberculosis in guinea pigs

Development of effective vaccine candidates against tuberculosis (TB) is currently the most important challenge in the prevention of this disease since the BCG vaccine fails to guarantee a lifelong protection, while any other approved vaccine with better efficiency is still absent. The protective effect of the recombinant fusion protein CFP10–ESAT6–dIFN produced in a prokaryotic expression system (Escherichia coli) has been assessed in a guinea pig model of acute TB. The tested antigen comprises the Mycobacterium tuberculosis (Mtb) proteins ESAT6 and CFP10 as well as modified human γ-interferon (dIFN) for boosting the immune response. Double intradermal immunization of guinea pigs with the tested fusion protein (2 × 0.5 µg) induces a protective effect against subsequent Mtb infection. The immunized guinea pigs do not develop the symptoms of acute TB and their body weight gain was five times more as compared with the non-immunized infected guinea pigs. The animal group immunized with this dose of antigen displays the minimum morphological changes in the internal organs and insignificant inflammatory lesions in the liver tissue, which complies with a decrease in the bacterial load in the spleen and average Mtb counts in macrophages

The impact of arterial input function determination variations on prostate dynamic contrast-enhanced magnetic resonance imaging pharmacokinetic modeling: a multicenter data analysis challenge, part II

This multicenter study evaluated the effect of variations in arterial input function (AIF) determination on pharmacokinetic (PK) analysis of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) data using the shutter-speed model (SSM). Data acquired from eleven prostate cancer patients were shared among nine centers. Each center used a site-specific method to measure the individual AIF from each data set and submitted the results to the managing center. These AIFs, their reference tissue-adjusted variants, and a literature population-averaged AIF, were used by the managing center to perform SSM PK analysis to estimate Ktrans (volume transfer rate constant), ve (extravascular, extracellular volume fraction), kep (efflux rate constant), and τi (mean intracellular water lifetime). All other variables, including the definition of the tumor region of interest and precontrast T1 values, were kept the same to evaluate parameter variations caused by variations in only the AIF. Considerable PK parameter variations were observed with within-subject coefficient of variation (wCV) values of 0.58, 0.27, 0.42, and 0.24 for Ktrans, ve, kep, and τi, respectively, using the unadjusted AIFs. Use of the reference tissue-adjusted AIFs reduced variations in Ktrans and ve (wCV = 0.50 and 0.10, respectively), but had smaller effects on kep and τi (wCV = 0.39 and 0.22, respectively). kep is less sensitive to AIF variation than Ktrans, suggesting it may be a more robust imaging biomarker of prostate microvasculature. With low sensitivity to AIF uncertainty, the SSM-unique τi parameter may have advantages over the conventional PK parameters in a longitudinal study

навчальний посібник

Конституційне право України: прагматичний курс : навч. посіб. / М. В. Афанасьєва, Ю. Ю. Бальцій, Ю. Д. Батан [та ін.] : за заг. ред. М. В. Афанасьєвої, А. А. Єзерова ; тех. ред. Ю. Д. Батан. - Одеса : Юридична література, 2017. - 256 с.Видання навчального посібника "Конституційне право України: прагматичний курс" спрямоване, передусім, врахувати потребу студентів у лаконічному та водночас комплексному викладенні навчального матеріалу, який би відповідав тематиці програми вступних випробувань з конституційного права України та відображав новітні конституційно-правові перетворення. Цінність даного посібника для вступників полягає в тому, що його структура дозволяє якнайкраще підготуватися до тестування, оскільки включає саме ті теми та питання, які включені до програми вступних випробувань. Крім того, прагматичний курс цінний для студентів 2-го курсу як опорний конспект лекцій при підготовці до практичних занять, а аткож до іспиту з конституційного права України. Навчальний посібник стане корисним при підготовці до державного екзаменаційного іспиту з конституційного права України для студентів 4-го курсу